The diesel engine oil available for your fleet is about to undergo a major change. Two new oil categories, CK-4 and FA-4, have been announced by the American Petroleum Institute (API) and will replace ...

API PC-12 engine oil categories CL-4 and FB-4 are advancing toward a 2027 launch. Here’s what the changes mean for fleets, ...

For two decades, we have seen a new API oil classification for on-highway heavy duty diesels every few years. Oil formulations had to change to meet the demands of diesel engines facing ...

January 1, 2027, will be the first license date for two new heavy-duty engine oil categories, if all goes as planned.